Put your base timming at 10 degrees, and leave the fuel pressure at 45. Try a colder plug a NGK FR5 is factory for that, so try a Autolite 3923, it is 1 step colder if that dosen't work try a NGK r5671-7 plug. I run 12psi with no retard or FMU with 36lbs injectors. Maybe your injectors aren't big enough.
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